synaptic vesicle

(redirected from Presynaptic vesicle)
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Related to Presynaptic vesicle: synaptic cleft, synaptic gap

synaptic vesicle

[si¦nap·tik ′ves·ə·kəl]
(neuroscience)
A small membrane-bound structure in the axon terminals of nerve cells that contains neurotransmitters and releases them by exocytosis when an action potential reaches the terminal.
References in periodicals archive ?
Bailey and Chen (1983, 1988a) have shown that behavioral training that induces LTH of siphon withdrawal produces a significant decrease in the number, size, and presynaptic vesicle complement of active zones associated with siphon sensory neurons, as well as fewer presynaptic varicosities on the branches of siphon sensory neurons.